Ignition Diagnostic Monitor

NOTE: Enter this test only when Code 01 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.

Fig 1: Identifying IDM Circuit & Connector (IDM)

IDM CIRCUIT PIN IDENTIFICATION

Circuit

PCM Pin

BOB Pin

Wire Color

IDM

YEL/BLU

PWR

⁽¹⁾

BLK/WHT

⁽¹⁾	Circuits are part of vehicle harness, and are not connected to PCM.

1) Connect spark tester between coil secondary wire and ground. Crank engine several times, leaving ignition on between cranking periods. If continuous sparks do not jump tester gap, go to step 3). If continuous sparks jump tester gap, go to next step.

2) Turn ignition off. Connect BOB. Leave PCM disconnected. Connect test light between BOB pins IDM and VPWR. Crank engine several times. If test light flashes each time engine cranks, IDM circuit is okay. Return to QUICK TESTS if directed here from there. If test light does not flash, repair IDM wire between ECA and coil.

3) Unplug connector from ignition coil. Connect test light between coil IDM wire and PWR wire. Crank engine several times, leaving ignition on between cranking periods. If test light does not flash continuously, go to step 5). If test light flashes continuously, go to next step.

4) Turn ignition on. Measure voltage between coil harness PWR wire and ground. If voltage is greater than 10 volts, replace coil. If voltage is less than 10 volts, repair wire between ignition switch and coil.

5) Unplug connector from ignition module. Connect a jumper wire between PWR wire on ignition module harness connector and mating terminal on ignition module. Leave IDM wire disconnected. Connect test light between IDM terminal on ignition module and PWR wire. Crank engine several times, leaving ignition on between cranking periods. If test light flashes each time engine cranks, repair wire between ignition module IDM wire and coil. If test light does not flash, go to next step.

6) Unplug connector from ignition module. Measure voltage between ignition module PWR wire and ground. If voltage is not higher than 10 volts, repair PWR wire from ignition switch. If voltage is higher than 10 volts, go to next step.

7) Turn ignition off. Unplug ignition module connector. Turn ignition on. Connect test light between ignition module PWR wire and ignition module GND wire. Turn ignition on. If test light glows, replace ignition module. If test light does not glow, repair ignition module ground wire.